ScktComp

Override TCustomSocket to create a socket component that can be assigned event handlers for the events and error conditions that occur. In addition to the properties and methods introduced by TAbstractSocket that enable an application to work with Windows sockets, TCustomSocket introduces several events that can be used by applications. 

Do not create instances of TCustomSocket. Use a descendant of TCustomSocket to add the ability to communicate with other machines using TCP/IP. To create a socket that initiates the connection with another machine, use TClientSocket. To create a socket that responds to requests for connections from other machines, use TServerSocket. 

TClientSocket 

TCustomWinSocket 

TServerSocket